This anime has so many things to offer amazing storyline, action, dark characters and more. Simply it is the most perfect anime you can watch right now if you haven't seen it.
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Fullmetal Alchemist Brotherhood
The story follows two brothers who started their journey to restore the body of their younger brother but later they found out about the dark side of their country.
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Death Note
A young student who is very intelligent found a notebook on the school campus. He can write anyone's name on that notebook and the person dies an unknown death.
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Made In abyss
Made in Abyss is one of the darkest anime and it is also an underrated anime. Don't be fooled by the looks of the characters you'll see so many dark things in this anime and you'll love it.
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Future Diary
Future Diary is another underrated anime which has amazing action, violence, style and love of a twisted couple. If you want to see something related to the future you should watch this.
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Elfen Lied
Elfen Lied revolves around the interactions, views, emotions, and differences between human beings and the Diclonii, a mutant species similar to humans. The story becomes more and more dark after every episode.
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Monster
This anime will change your beliefs and make you question your humanity. This anime plays psychological games with you and keeps engaged with the characters all the time.
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Neon Genesis Evangelion
If you want to watch an anime which has everything in it then you should watch this. It has an amazing storyline, characters and action with a really dark story which will make you sad.